/*
 * Copyright 2019 Data Artisans GmbH Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License. You may obtain a copy of the
 * License at http://www.apache.org/licenses/LICENSE-2.0 Unless required by applicable law or agreed
 * to in writing, software distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
 * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the License for the specific
 * language governing permissions and limitations under the License.
 */

package com.dataartisans.flinktraining.exercises.datastream_java.utils;

import org.apache.flink.api.common.typeinfo.TypeInformation;
import org.apache.flink.table.api.Types;
import org.apache.flink.table.functions.ScalarFunction;

import java.sql.Timestamp;

public class TimeDiff extends ScalarFunction {

    public long eval(Timestamp first, Timestamp second) {
        return java.time.Duration.between(first.toInstant(), second.toInstant()).toMillis();
    }

    @Override
    public TypeInformation<?> getResultType(Class<?>[] signature) {
        return Types.LONG();
    }
}
